<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>jQuerya源码解析</title>
    <!--<script src="libs/jquery-1.12.4.js"></script>-->
    <script src="./sizzle.js"></script>
    <script src="./my_jquery.js"></script>
</head>
<body>
    <h1>大家好</h1>
    <h1>大家好</h1>
    <h1>大家好</h1>
</body>
<script>
   $('h1').on('click',function(){
       $(this).css('color','red')
              .css('fontSize','18px')
              .css('backgroundColor','blue')
   })

</script>
</html>